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buildflags.md: Document source tree patching during %configure

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Florian Weimer 2021-11-16 17:22:45 +01:00
parent 69360e1d57
commit aee37a70c1
1 changed files with 24 additions and 1 deletions
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@ -13,6 +13,8 @@ this:
This will invoke the `./configure` with arguments (such as This will invoke the `./configure` with arguments (such as
`--prefix=/usr`) to adjust the paths to the packaging defaults. `--prefix=/usr`) to adjust the paths to the packaging defaults.
Prior to that, some common problems in autotools scripts are
automatically patched across the source tree.
As a side effect, this will set the environment variables `CFLAGS`, As a side effect, this will set the environment variables `CFLAGS`,
`CXXFLAGS`, `FFLAGS`, `FCFLAGS`, `LDFLAGS` and `LT_SYS_LIBRARY_PATH`, `CXXFLAGS`, `FFLAGS`, `FCFLAGS`, `LDFLAGS` and `LT_SYS_LIBRARY_PATH`,
@ -25,7 +27,8 @@ environment variables using
%set_build_flags %set_build_flags
early in the `%build` section. (Again, existing environment variables early in the `%build` section. (Again, existing environment variables
are not overwritten.) are not overwritten.) `%set_build_flags` does not perform autotools
script rewriting, unlike `%configure`.
Individual build flags are also available through RPM macros: Individual build flags are also available through RPM macros:
@ -105,6 +108,21 @@ or:
BuildRequires: clang compiler-rt BuildRequires: clang compiler-rt
%endif %endif
### Disable autotools compatibility patching
By default, the invocation of the `%configure` macro replaces
`config.guess` files in the source tree with the system version. To
disable that, define this macro:
%global _configure_gnuconfig_hack 0
`%configure` also patches `ltmain.sh` scripts, so that linker flags
are set as well during libtool-. This can be switched off using:
%global _configure_libtool_hardening_hack 0
Further patching happens in LTO mode, see below.
### Disabling Link-Time Optimization ### Disabling Link-Time Optimization
By default, builds use link-time optimization. In this build mode, By default, builds use link-time optimization. In this build mode,
@ -116,6 +134,11 @@ To disable this optimization, include this in the spec file:
%define _lto_cflags %{nil} %define _lto_cflags %{nil}
If LTO is enabled, `%configure` applies some common required fixes to
`configure` scripts. To disable that, define the RPM macro
`_fix_broken_configure_for_lto` as `true` (sic; it has to be a shell
command).
### Lazy binding ### Lazy binding
If your package depends on the semantics of lazy binding (e.g., it has If your package depends on the semantics of lazy binding (e.g., it has