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| author | Herbert Valerio Riedel <hvr@gnu.org> | 2016-03-28 14:34:22 +0200 |
|---|---|---|
| committer | Herbert Valerio Riedel <hvr@gnu.org> | 2016-03-28 14:57:43 +0200 |
| commit | afc48f8939b99a1a72b43b3e342d56193ed1f34c (patch) | |
| tree | a29656df4a3cf3250d1283f3c4668e126c06e83c /distrib | |
| parent | ffc802e8f617d11de9ece7bed438725bde0300b8 (diff) | |
| download | haskell-afc48f8939b99a1a72b43b3e342d56193ed1f34c.tar.gz | |
Autoconf: detect and set CFLAGS/CPPFLAGS needed for C99 mode
This is the first phase of addressing #11757 which aims to make C99
support a base-line requirement for GHC and clean up the code-base to
use C99 facilities when sensible.
This patch exploits the logic/heuristic used by `AC_PROG_CC_C99` to
determine the flags needed in case the C compiler isn't able to compile
C99 code in its current mode. We can't use `AC_PROG_CC_C99` directly
though because GHC's build-system expects CC to contain a filename
without any flags, while `AC_PROG_CC_C99` would e.g. result in
`CC="gcc -std=gnu99"`. Morever, we support different `CC`s for
stage0/1/2, so we need a version of `AC_PROG_CC_C99` for which we can
specify the `CC`/`CFLAGS` variables to operate on. This is what
`FP_SET_CFLAGS_C99` does.
Note that Clang has been defaulting to C99+ for a long time, while GCC 5
defaults to C99+ as well. So this has mostly an affect on older GCCs
versions prior to 5.0 and possibly compilers other than GCC/Clang (which
are not officially supported for building GHC anyway).
Reviewers: kgardas, erikd, bgamari, austin
Reviewed By: erikd
Differential Revision: https://phabricator.haskell.org/D2045
Diffstat (limited to 'distrib')
| -rw-r--r-- | distrib/configure.ac.in | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/distrib/configure.ac.in b/distrib/configure.ac.in index 99b51f536b..1df58d508b 100644 --- a/distrib/configure.ac.in +++ b/distrib/configure.ac.in @@ -109,6 +109,11 @@ dnl ** Check gcc version and flags we need to pass it ** # FP_GCC_EXTRA_FLAGS +FP_SET_CFLAGS_C99([CC],[CFLAGS],[CPPFLAGS]) +dnl FP_SET_CFLAGS_C99([CC_STAGE0],[CONF_CC_OPTS_STAGE0],[CONF_CPP_OPTS_STAGE0]) +FP_SET_CFLAGS_C99([CC],[CONF_CC_OPTS_STAGE1],[CONF_CPP_OPTS_STAGE1]) +FP_SET_CFLAGS_C99([CC],[CONF_CC_OPTS_STAGE2],[CONF_CPP_OPTS_STAGE2]) + FPTOOLS_SET_C_LD_FLAGS([target],[CFLAGS],[LDFLAGS],[IGNORE_LINKER_LD_FLAGS],[CPPFLAGS]) FPTOOLS_SET_C_LD_FLAGS([build],[CONF_CC_OPTS_STAGE0],[CONF_GCC_LINKER_OPTS_STAGE0],[CONF_LD_LINKER_OPTS_STAGE0],[CONF_CPP_OPTS_STAGE0]) FPTOOLS_SET_C_LD_FLAGS([target],[CONF_CC_OPTS_STAGE1],[CONF_GCC_LINKER_OPTS_STAGE1],[CONF_LD_LINKER_OPTS_STAGE1],[CONF_CPP_OPTS_STAGE1]) |