@@ -, +, @@ 
    $ ./configure CFLAGS=-flto=2 LDFLAGS=-flto=2
    ...
    configure:3856: gcc -flto=2  -flto=2 conftest.c  >&5
    cc: error trying to exec '/usr/libexec/gcc/x86_64-pc-linux-gnu/8.3.0/collect2': execv: Argument list too long
    make[7]: *** [<builtin>: all] Error 1
---
 Makefile.am            | 16 ++++++++--------
 all.c                  |  1 -
 all_headers.c          |  1 +
 all.h => all_headers.h |  0
 4 files changed, 9 insertions(+), 9 deletions(-)
 delete mode 100644 all.c
 create mode 100644 all_headers.c
 rename all.h => all_headers.h (100%)
--- a/Makefile.am	
+++ a/Makefile.am	
@@ -317,7 +317,7 @@ isl_test_cpp_checked_conversion_LDADD = libisl.la @MP_LIBS@
 # dummy library that captures the dependencies on all headers
 # that are relevant for the bindings
 noinst_LIBRARIES = libdep.a
-libdep_a_SOURCES = all.c
+libdep_a_SOURCES = all_headers.c
 
 if HAVE_CLANG
 interface/isldlname.py: libisl.la
@@ -326,27 +326,27 @@ interface/isl.py: interface/extract_interface libdep.a python/isl.py.top \
 		interface/isldlname.py
 	(cat interface/isldlname.py $(srcdir)/python/isl.py.top && \
 		interface/extract_interface$(EXEEXT) --language=python \
-			$(includes) $(srcdir)/all.h) \
+			$(includes) $(srcdir)/all_headers.h) \
 			> $@ || (rm $@ && false)
 
 include/isl/cpp.h: interface/extract_interface libdep.a \
 		cpp/cpp.h.top cpp/cpp.h.pre cpp/cpp.h.bot
 	$(MKDIR_P) "include/isl/cpp" && \
-	(cat $(srcdir)/cpp/cpp.h.top $(srcdir)/all.h \
+	(cat $(srcdir)/cpp/cpp.h.top $(srcdir)/all_headers.h \
 	    $(srcdir)/cpp/cpp.h.pre && \
 		interface/extract_interface$(EXEEXT) --language=cpp \
-			$(includes) $(srcdir)/all.h && \
+			$(includes) $(srcdir)/all_headers.h && \
 		cat $(srcdir)/cpp/cpp.h.bot) \
 			> $@ || (rm $@ && false)
 
 include/isl/cpp-checked.h: interface/extract_interface libdep.a \
 		cpp/cpp-checked.h.top \
 		cpp/cpp-checked.h.pre cpp/cpp-checked.h.bot
-	(cat $(srcdir)/cpp/cpp-checked.h.top $(srcdir)/all.h \
+	(cat $(srcdir)/cpp/cpp-checked.h.top $(srcdir)/all_headers.h \
 	    $(srcdir)/cpp/cpp-checked.h.pre && \
 		interface/extract_interface$(EXEEXT) \
 			--language=cpp-checked \
-			$(includes) $(srcdir)/all.h && \
+			$(includes) $(srcdir)/all_headers.h && \
 		cat $(srcdir)/cpp/cpp-checked.h.bot) \
 			> $@ || (rm $@ && false)
 
@@ -356,7 +356,7 @@ include/isl/cpp-checked-conversion.h: interface/extract_interface libdep.a \
 	(cat $(srcdir)/cpp/cpp-checked-conversion.h.top && \
 		interface/extract_interface$(EXEEXT) \
 			--language=cpp-checked-conversion \
-			$(includes) $(srcdir)/all.h && \
+			$(includes) $(srcdir)/all_headers.h && \
 		cat $(srcdir)/cpp/cpp-checked-conversion.h.bot) \
 			> $@ || (rm $@ && false)
 endif
@@ -526,7 +526,7 @@ EXTRA_DIST = \
 	imath/imath.h \
 	imath/imrat.c \
 	imath/imrat.h \
-	all.h \
+	all_headers.h \
 	cpp \
 	python \
 	isl_test_cpp-generic.cc \
--- a/all.c	
+++ a/all.c	
@@ -1, +0,0 @@ 
-#include "all.h"
--- a/all_headers.c	
+++ a/all_headers.c	
@@ -0,0 +1, @@ 
+#include "all_headers.h"