[Git][ghc/ghc][master] Revert "configure: Drop uses of AC_PROG_CC_C99"

[Marge Bot (@marge-bot)]

Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC


Commits:
b2a2db04 by Matthew Pickering at 2023-01-05T23:02:30-05:00
Revert "configure: Drop uses of AC_PROG_CC_C99"

This reverts commit 7c6de18dd3151ead954c210336728e8686c91de6.

Centos7 using a very old version of the toolchain (autotools-2.69) where
the behaviour of these macros has not yet changed. I am reverting this
without haste as it is blocking the 9.6 branch.

Fixes #22704

- - - - -


3 changed files:

- configure.ac
- distrib/configure.ac.in
- + m4/fp_set_cflags_c99.m4


Changes:

=====================================
configure.ac
=====================================
@@ -485,6 +485,11 @@ FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
 AC_SUBST([HaskellCPPCmd])
 AC_SUBST([HaskellCPPArgs])
 
+FP_SET_CFLAGS_C99([CC],[CFLAGS],[CPPFLAGS])
+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])
+
 dnl ** Which ld to use
 dnl --------------------------------------------------------------
 AC_ARG_VAR(LD,[Use as the path to ld. See also --disable-ld-override.])


=====================================
distrib/configure.ac.in
=====================================
@@ -111,6 +111,11 @@ FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
 AC_SUBST([HaskellCPPCmd])
 AC_SUBST([HaskellCPPArgs])
 
+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])
+
 dnl ** Which ld to use?
 dnl --------------------------------------------------------------
 FIND_LD([$target],[GccUseLdOpt])


=====================================
m4/fp_set_cflags_c99.m4
=====================================
@@ -0,0 +1,38 @@
+# FP_SET_CFLAGS_C99
+# ----------------------------------
+# figure out which CFLAGS are needed to place the compiler into C99 mode
+# $1 is name of CC variable (unmodified)
+# $2 is name of CC flags variable (augmented if needed)
+# $3 is name of CPP flags variable (augmented if needed)
+AC_DEFUN([FP_SET_CFLAGS_C99],
+[
+    dnl save current state of AC_PROG_CC_C99
+    FP_COPY_SHELLVAR([CC],[fp_save_CC])
+    FP_COPY_SHELLVAR([CFLAGS],[fp_save_CFLAGS])
+    FP_COPY_SHELLVAR([CPPFLAGS],[fp_save_CPPFLAGS])
+    FP_COPY_SHELLVAR([ac_cv_prog_cc_c99],[fp_save_cc_c99])
+    dnl set local state
+    CC="$$1"
+    CFLAGS="$$2"
+    CPPFLAGS="$$3"
+    unset ac_cv_prog_cc_c99
+    dnl perform detection
+    AC_PROG_CC_C99
+    fp_cc_c99="$ac_cv_prog_cc_c99"
+    case "x$ac_cv_prog_cc_c99" in
+      x)   ;; # noop
+      xno) AC_MSG_ERROR([C99-compatible compiler needed]) ;;
+      *)   $2="$$2 $ac_cv_prog_cc_c99"
+           $3="$$3 $ac_cv_prog_cc_c99"
+           ;;
+    esac
+    dnl restore saved state
+    FP_COPY_SHELLVAR([fp_save_CC],[CC])
+    FP_COPY_SHELLVAR([fp_save_CFLAGS],[CFLAGS])
+    FP_COPY_SHELLVAR([fp_save_CPPFLAGS],[CPPFLAGS])
+    FP_COPY_SHELLVAR([fp_save_cc_c99],[ac_cv_prog_cc_c99])
+    dnl cleanup
+    unset fp_save_CC
+    unset fp_save_CFLAGS
+    unset fp_save_cc_c99
+])



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/b2a2db04b24a4654261db8e0db6ad7bac1b3d7cf

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/b2a2db04b24a4654261db8e0db6ad7bac1b3d7cf
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