I have elsewhere described my frustration in trying, during development,
to set more stringent error-finding and warning-generating compilation
options. But they seem to require the use of CXXFLAGS, which in at least
the case of trying to set -std=c++14, causes libcody's compilation to
fail, since it wants, specifically c++11.
So, I dove in and figured out how to implement CXXFLAGS_FOR_COBOL. This
new flag applies only to compilations of c++ programs in the gcc/cobol
source code tree.
These changes were tested with a bootstrap build of
--enable-languages=c,c++,fortran,cobol.
Is this okay for trunk?
Thanks.
Bob Dubner
>From ff295ac4ba9728fdd8d97fa73754cd17a21d0f18 Mon Sep 17 00:00:00 2001
From: Robert Dubner <rdub...@symas.com>
Date: Mon, 7 Jul 2025 16:34:09 -0400
Subject: [PATCH] cobol: Implement CXXFLAGS_FOR_COBOL.
It's useful during development to be able to specify compilation options
that
apply only to the COBOL front end. These changes provide the ability to
set persistent flags at configure time:
CXXFLAGS_FOR_COBOL=xxx ../configure ....
while providing the ability to subsequently override them at build time
make CXXFLAGS_FOR_COBOL=yyy
ChangeLog:
* configure.ac: Create output variable @CXXFLAGS_FOR_COBOL@.
* Makefile.def: Include CXXFLAGS_FOR_COBOL in flags_to_pass.
* Makefile.tpl: Include CXXFLAGS_FOR_COBOL in HOST_EXPORTS;
incorporate @CXXFLAGS_FOR_COBOL@.
* configure: Regenerated.
* Makefile.in: Regenerated
gcc/cobol/ChangeLog:
* Make-lang.in: Use CXXFLAGS_FOR_COBOL in gcc/cobol compilations.
---
Makefile.def | 1 +
Makefile.in | 3 +++
Makefile.tpl | 2 ++
configure | 2 ++
configure.ac | 1 +
gcc/cobol/Make-lang.in | 20 ++++++++++++++++++++
6 files changed, 29 insertions(+)
diff --git a/Makefile.def b/Makefile.def
index fa60f6ea0b9..bd17c89b875 100644
--- a/Makefile.def
+++ b/Makefile.def
@@ -304,6 +304,7 @@ flags_to_pass = { flag= BOOT_CFLAGS ; };
flags_to_pass = { flag= BOOT_LDFLAGS ; };
flags_to_pass = { flag= CFLAGS ; };
flags_to_pass = { flag= CXXFLAGS ; };
+flags_to_pass = { flag= CXXFLAGS_FOR_COBOL ; };
flags_to_pass = { flag= LDFLAGS ; };
flags_to_pass = { flag= LIBCFLAGS ; };
flags_to_pass = { flag= LIBCXXFLAGS ; };
diff --git a/Makefile.in b/Makefile.in
index 12d4395d8e2..1ab2efbc612 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -203,6 +203,7 @@ HOST_EXPORTS = \
CONFIG_SHELL="$(SHELL)"; export CONFIG_SHELL; \
CXX="$(CXX)"; export CXX; \
CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+ CXXFLAGS_FOR_COBOL="$(CXXFLAGS_FOR_COBOL)"; export
CXXFLAGS_FOR_COBOL; \
GFORTRAN="$(GFORTRAN)"; export GFORTRAN; \
GOC="$(GOC)"; export GOC; \
GDC="$(GDC)"; export GDC; \
@@ -451,6 +452,7 @@ CFLAGS = @CFLAGS@
LDFLAGS = @LDFLAGS@
LIBCFLAGS = $(CFLAGS)
CXXFLAGS = @CXXFLAGS@
+CXXFLAGS_FOR_COBOL = @CXXFLAGS_FOR_COBOL@
LIBCXXFLAGS = $(CXXFLAGS) -fno-implicit-templates
GOCFLAGS = $(CFLAGS)
GDCFLAGS = @GDCFLAGS@
@@ -882,6 +884,7 @@ BASE_FLAGS_TO_PASS = \
"BOOT_LDFLAGS=$(BOOT_LDFLAGS)" \
"CFLAGS=$(CFLAGS)" \
"CXXFLAGS=$(CXXFLAGS)" \
+ "CXXFLAGS_FOR_COBOL=$(CXXFLAGS_FOR_COBOL)" \
"LDFLAGS=$(LDFLAGS)" \
"LIBCFLAGS=$(LIBCFLAGS)" \
"LIBCXXFLAGS=$(LIBCXXFLAGS)" \
diff --git a/Makefile.tpl b/Makefile.tpl
index ddcca558913..047845b7692 100644
--- a/Makefile.tpl
+++ b/Makefile.tpl
@@ -206,6 +206,7 @@ HOST_EXPORTS = \
CONFIG_SHELL="$(SHELL)"; export CONFIG_SHELL; \
CXX="$(CXX)"; export CXX; \
CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+ CXXFLAGS_FOR_COBOL="$(CXXFLAGS_FOR_COBOL)"; export
CXXFLAGS_FOR_COBOL; \
GFORTRAN="$(GFORTRAN)"; export GFORTRAN; \
GOC="$(GOC)"; export GOC; \
GDC="$(GDC)"; export GDC; \
@@ -454,6 +455,7 @@ CFLAGS = @CFLAGS@
LDFLAGS = @LDFLAGS@
LIBCFLAGS = $(CFLAGS)
CXXFLAGS = @CXXFLAGS@
+CXXFLAGS_FOR_COBOL = @CXXFLAGS_FOR_COBOL@
LIBCXXFLAGS = $(CXXFLAGS) -fno-implicit-templates
GOCFLAGS = $(CFLAGS)
GDCFLAGS = @GDCFLAGS@
diff --git a/configure b/configure
index ccec3f21cd8..c8e6d729f1b 100755
--- a/configure
+++ b/configure
@@ -624,6 +624,7 @@ RANLIB_PLUGIN_OPTION
AR_PLUGIN_OPTION
PKG_CONFIG_PATH
GDCFLAGS
+CXXFLAGS_FOR_COBOL
READELF
OTOOL
OBJDUMP
@@ -14218,6 +14219,7 @@ fi
+
GDCFLAGS=${GDCFLAGS-${CFLAGS}}
diff --git a/configure.ac b/configure.ac
index 55d10265958..6153b1d7957 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4010,6 +4010,7 @@ AC_SUBST(CC)
AC_SUBST(CXX)
AC_SUBST(CFLAGS)
AC_SUBST(CXXFLAGS)
+AC_SUBST(CXXFLAGS_FOR_COBOL)
AC_SUBST(GDC)
AC_SUBST(GDCFLAGS)
GDCFLAGS=${GDCFLAGS-${CFLAGS}}
diff --git a/gcc/cobol/Make-lang.in b/gcc/cobol/Make-lang.in
index 18eb3b0f1e5..1e60cea060e 100644
--- a/gcc/cobol/Make-lang.in
+++ b/gcc/cobol/Make-lang.in
@@ -384,3 +384,23 @@ cobol.stagefeedback: stagefeedback-start
selftest-cobol:
lang_checks += check-cobol
+
+#
+# Front-end specific flags: Originally done for the COBOL front end,
this
+# scripting applies CXXFLAGS_FOR_COBOL only to compilations of source
code in the
+# gcc/cobol source code tree. Both forms can be used:
+#
+# CXXFLAGS_FOR_COBOL=xxx ../configure --enable-languages=....
+# and
+# make <gcc> CXXFLAGS_FOR_COBOL=yyy
+#
+# The second form overrides the first.
+#
+# To apply this feature to other front ends, look for and clone lines
+# containing "CXXFLAGS_FOR_COBOL" in configure.ac, Makefile.tbl, and
Makefile.def.
+#
+
+cobol/%.o: cobol/%.cc
+ @echo $(COMPILE) $(CXXFLAGS_FOR_COBOL) $<
+ $(COMPILE) $(CXXFLAGS_FOR_COBOL) $<
+ $(POSTCOMPILE)
--
2.34.1
