67 lines
2.6 KiB
Diff
67 lines
2.6 KiB
Diff
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Avoid implicit ints in the configure script, to prevent checks from
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failing unconditionally with future compilers that do not support
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them by default.
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diff --git a/configure b/configure
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index 2dd357d4f253946f..cffa76cdb8d68887 100755
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--- a/configure
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+++ b/configure
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@@ -4007,7 +4007,7 @@ $as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
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# System-depending optimization
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printf 'checking for 64-bit availability... '
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-if printf 'main() {}' | $CC -xc -m64 -o config.tmp - >config.tmp 2>&1
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+if printf 'int main(void) {return 0;}' | $CC -xc -m64 -o config.tmp - >config.tmp 2>&1
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then
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MYCFLAGS="-m64 $MYCFLAGS"
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MYCXXFLAGS="-m64 $MYCXXFLAGS"
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@@ -4018,7 +4018,7 @@ fi
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if test "$enable_opt" != "no"
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then
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printf 'checking for CPU optimization availability... '
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- if printf 'main() {}' | $CC -xc -march=native -o config.tmp - >config.tmp 2>&1
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+ if printf 'int main(void) {return 0;}' | $CC -xc -march=native -o config.tmp - >config.tmp 2>&1
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then
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MYCFLAGS="-march=native $MYCFLAGS"
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MYCXXFLAGS="-march=native $MYCXXFLAGS"
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@@ -4028,7 +4028,7 @@ then
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fi
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fi
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printf 'checking for useless warnings... '
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-if printf 'main() {}' | $CC -xc \
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+if printf 'int main(void) {return 0;}' | $CC -xc \
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-Wno-unused-but-set-variable -Wno-unused-but-set-parameter -o config.tmp - >config.tmp 2>&1
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then
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MYCFLAGS="$MYCFLAGS -Wno-unused-but-set-variable -Wno-unused-but-set-parameter"
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diff --git a/configure.in b/configure.in
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index 6ce03e3313a211de..5abb5c33281b9da8 100644
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--- a/configure.in
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+++ b/configure.in
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@@ -204,7 +204,7 @@ AC_C_BIGENDIAN(MYCPPFLAGS="$MYCPPFLAGS -D_MYBIGEND")
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# System-depending optimization
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printf 'checking for 64-bit availability... '
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-if printf 'main() {}' | $CC -xc -m64 -o config.tmp - >config.tmp 2>&1
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+if printf 'int main(void) {return 0;}' | $CC -xc -m64 -o config.tmp - >config.tmp 2>&1
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then
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MYCFLAGS="-m64 $MYCFLAGS"
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MYCXXFLAGS="-m64 $MYCXXFLAGS"
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@@ -215,7 +215,7 @@ fi
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if test "$enable_opt" != "no"
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then
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printf 'checking for CPU optimization availability... '
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- if printf 'main() {}' | $CC -xc -march=native -o config.tmp - >config.tmp 2>&1
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+ if printf 'int main(void) {return 0;}' | $CC -xc -march=native -o config.tmp - >config.tmp 2>&1
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then
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MYCFLAGS="-march=native $MYCFLAGS"
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MYCXXFLAGS="-march=native $MYCXXFLAGS"
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@@ -225,7 +225,7 @@ then
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fi
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fi
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printf 'checking for useless warnings... '
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-if printf 'main() {}' | $CC -xc \
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+if printf 'int main(void) {return 0;}' | $CC -xc \
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-Wno-unused-but-set-variable -Wno-unused-but-set-parameter -o config.tmp - >config.tmp 2>&1
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then
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MYCFLAGS="$MYCFLAGS -Wno-unused-but-set-variable -Wno-unused-but-set-parameter"
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