Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:err_go_lang_et_langage_c [2026/04/21 21:10] – Jean-Baptiste
+++ tech:err_go_lang_et_langage_c [2026/04/21 21:37] (Version actuelle) – Jean-Baptiste
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon Go C Dev}}
+# Err Go lang et langage C
+Voir aussi :
+* [[Inclure du C dans Go lang]]
+## Err: could not determine what C.factorial refers to
+~~~
+# command-line-arguments
+./maint.go:25:43: could not determine what C.factorial refers to
+~~~
+### Solution
+Remplacer
+~~~go
+package main
+// #include <stdio.h>
+// #include <stdlib.h>
+//
+// uint factorial(uint N) {
+//     int fact = 1, i;
+//
+//     // Loop from 1 to N to get the factorial
+//     for (i = 1; i <= N; i++) {
+//         fact *= i;
+//     }
+//
+//     return fact;
+// }
+import "C"
+~~~
+Par
+~~~go
+package main
+// #include <stdio.h>
+// #include <stdlib.h>
+//
+// uint factorial(uint N) {
+//     int fact = 1, i;
+//
+//     // Loop from 1 to N to get the factorial
+//     for (i = 1; i <= N; i++) {
+//         fact *= i;
+//     }
+//
+//     return fact;
+// }
+import "C"
+~~~
+Il ne faut pas d'espace entre le bloque du code C et `import "C"`
+## Err: cannot use i (variable of type int) as _Ctype_uint value in argument to (_Cfunc_factorial)
+### Solution
+Il faut caster. Ici dans notre exemple avec `C.uint()`
+~~~go
+package main
+// #include <stdio.h>
+// #include <stdlib.h>
+//
+// uint factorial(uint N) {
+//     int fact = 1, i;
+//
+//     // Loop from 1 to N to get the factorial
+//     for (i = 1; i <= N; i++) {
+//         fact *= i;
+//     }
+//
+//     return fact;
+// }
+import "C"
+import "fmt"
+func main() {
+	for i := range 10 {
+		//fmt.Printf("i: %.3d;, fact: %.6d\n", i, C.factorial(i))
+		fmt.Printf("i: %.3d;, fact: %.6d\n", i, C.factorial(C.uint(i)))
+		i++
+	}
+}
+~~~
+## Err: go: no Go source files
+Compilation croisée avec du code Go contenant du C
+~~~
+$ env GOOS=windows go build main.go
+go: no Go source files
+~~~
+### Solution
+~~~
+$ env CGO_ENABLED=1 GOOS=windows go build main.go
+# runtime/cgo
+gcc: error: unrecognized command-line option ‘-mthreads’; did you mean ‘-pthread’?
+# runtime/cgo
+gcc: error: unrecognized command-line option ‘-mthreads’; did you mean ‘-pthread’?
+~~~
+Installer les deps pour compiler
+~~~bash
+sudo apt-get install gcc-multilib gcc-mingw-w64
+~~~
+Lancer la compilation
+~~~
+$ env GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CXX=x86_64-w64-mingw32-g++ CC=x86_64-w64-mingw32-gcc go build main.go
+# command-line-arguments
+./main.go:22:43: could not determine what C.factorial refers to
+cgo:
+x86_64-w64-mingw32-gcc errors for preamble:
+./main.go:6:2: error: unknown type name 'uint'; did you mean 'int'?
+| // uint factorial(uint N) {
+      |  ^~~~
+      |  int
+./main.go:6:17: error: unknown type name 'uint'; did you mean 'int'?
+| // uint factorial(uint N) {
+      |                 ^~~~
+      |                 int
+~~~
+Remplacer les unsigned int (uint) par des int
+~~~bash
+sed -i.bak -e 's/uint/int/g' main.go
+env GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CXX=x86_64-w64-mingw32-g++ CC=x86_64-w64-mingw32-gcc go build main.go
+~~~
+C'est tout de même problématique